Hi Sarah,
Looks to be a Seamaster maybe mid 50s. Is it gold or Stainless (looks to be Stainless steel)? Is the caseback snap on or screw down and can you get the back off? If you could get the numbers from inside the caseback and the caliber # & serial # we could be of more help to you. If its a snap on back, you should be able to get a fingernail or small knife under the lip on the caseback and work it off. Its not too hard. If its a screw down back, I recommend you wad up a bunch of tape into a ball and press down on the back and turn. It might be a little hard at first, but once it gets moving, it will unscrew pretty easily. Just be careful to not touch the movement with the caseback when you take it off. Turn it face up and the back will come off in your hand. Dont worry, the movement won't fall out.
My guess at it would be a caliber 500-automatic, with caseback ref #2846-2848. The dial has been refinished to black. Most likely that dial was solid silver or 2-tone brushed/polished silver originally. The crown stem looks to be bent which may or not be a big issue. Overall, the case seems to be in decent shape. That speidel band is not original to the watch. They came with leather straps. Most likely the watch would need a service also. You can probably get the dial refinished to the original color. Not too expensive. To service the watch and get it back to nice shape, looking at probably $250-$300 or so plus the redial(maybe $50-$100 if you want do it). Nice leather strap and new buckle maybe another $50-$100.
I hope you didn't pay too much for it. The going rate for Stainless steel, cal 500 pieces in that condition is around $150-$200.
